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Long-Term Debt (Schedule of carrying value of Notes and Warrants) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Equity component:    
Warrants [1] $ 318 $ 318
Conversion feature [1] 122 122
Net carrying amount [1] 440 440
Secured convertible notes    
Liability component:    
Principal 3,000 3,000
Less: debt discount and issuance costs, net of amortization (581) (778)
Net carrying amount 2,419 2,222
Equity component:    
Current portion of liability component included under short-term debt 360
Long-term portion of liability component included under long-term debt 2,059 2,222
Liability component total $ 2,419 $ 2,222
[1] Recorded on the consolidated balance sheets as additional paid-in capital.